QUESTION 3 Assume that x, y and z are Boolean variables. Which of the following Boolean expressions is equivalent to (x ty+zx +y+z)? ob.xy +27 QUESTION4 Let fx, y, z) = x +yz be a Boolean function on three Boolean variables, x, y and z. Then the domain and range of are a.o,1 and (0,1) ob.(o,13 and (0,1). ? ?. {0,1}2 and {O,1). d(0,1) and (0